Re: [PATCH 3/3] pmbus: ibm-cffps: Add support for version 2 of the PSU

[Eddie James <eajames@linux.ibm.com>]

On 8/30/19 12:36 PM, Guenter Roeck wrote:
> On Fri, Aug 30, 2019 at 11:09:45AM -0500, Eddie James wrote:
>> Version 2 of the PSU supports a second page of data and changes the
>> format of the FW version. Use the devicetree binding to differentiate
>> between the version the driver should use.
>>
>> Signed-off-by: Eddie James <eajames@linux.ibm.com>
>> ---
>>   drivers/hwmon/pmbus/ibm-cffps.c | 109 ++++++++++++++++++++++++++++++++--------
>>   1 file changed, 87 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
>> index ee2ee9e..ca26fbd 100644
>> --- a/drivers/hwmon/pmbus/ibm-cffps.c
>> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
>> @@ -12,16 +12,20 @@
>>   #include <linux/leds.h>
>>   #include <linux/module.h>
>>   #include <linux/mutex.h>
>> +#include <linux/of_device.h>
>>   #include <linux/pmbus.h>
>>   
>>   #include "pmbus.h"
>>   
>> +#define CFFPS_VERSIONS				2
>> +
> Any chance you can use an enum for the versions ? Using version
> numbers 1/2 combined with array indices 0/1 is confusing, error
> prone, and seems unnecessary.


Sure, good idea.

Thanks,

Eddie


>
> Thanks,
> Guenter
>
>>   #define CFFPS_FRU_CMD				0x9A
>>   #define CFFPS_PN_CMD				0x9B
>>   #define CFFPS_SN_CMD				0x9E
>>   #define CFFPS_CCIN_CMD				0xBD
>> -#define CFFPS_FW_CMD_START			0xFA
>> -#define CFFPS_FW_NUM_BYTES			4
>> +#define CFFPS_FW_CMD				0xFA
>> +#define CFFPS1_FW_NUM_BYTES			4
>> +#define CFFPS2_FW_NUM_WORDS			3
>>   #define CFFPS_SYS_CONFIG_CMD			0xDA
>>   
>>   #define CFFPS_INPUT_HISTORY_CMD			0xD6
>> @@ -61,6 +65,7 @@ struct ibm_cffps_input_history {
>>   };
>>   
>>   struct ibm_cffps {
>> +	int version;
>>   	struct i2c_client *client;
>>   
>>   	struct ibm_cffps_input_history input_history;
>> @@ -132,6 +137,8 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>>   	struct ibm_cffps *psu = to_psu(idxp, idx);
>>   	char data[I2C_SMBUS_BLOCK_MAX] = { 0 };
>>   
>> +	pmbus_set_page(psu->client, 0);
>> +
>>   	switch (idx) {
>>   	case CFFPS_DEBUGFS_INPUT_HISTORY:
>>   		return ibm_cffps_read_input_history(psu, buf, count, ppos);
>> @@ -152,16 +159,36 @@ static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf,
>>   		rc = snprintf(data, 5, "%04X", rc);
>>   		goto done;
>>   	case CFFPS_DEBUGFS_FW:
>> -		for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) {
>> -			rc = i2c_smbus_read_byte_data(psu->client,
>> -						      CFFPS_FW_CMD_START + i);
>> -			if (rc < 0)
>> -				return rc;
>> +		switch (psu->version) {
>> +		case 1:
>> +			for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
>> +				rc = i2c_smbus_read_byte_data(psu->client,
>> +							      CFFPS_FW_CMD +
>> +								i);
>> +				if (rc < 0)
>> +					return rc;
>> +
>> +				snprintf(&data[i * 2], 3, "%02X", rc);
>> +			}
>>   
>> -			snprintf(&data[i * 2], 3, "%02X", rc);
>> -		}
>> +			rc = i * 2;
>> +			break;
>> +		case 2:
>> +			for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
>> +				rc = i2c_smbus_read_word_data(psu->client,
>> +							      CFFPS_FW_CMD +
>> +								i);
>> +				if (rc < 0)
>> +					return rc;
>> +
>> +				snprintf(&data[i * 4], 5, "%04X", rc);
>> +			}
>>   
>> -		rc = i * 2;
>> +			rc = i * 4;
>> +			break;
>> +		default:
>> +			return -EOPNOTSUPP;
>> +		}
>>   		goto done;
>>   	default:
>>   		return -EINVAL;
>> @@ -279,6 +306,8 @@ static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
>>   			psu->led_state = CFFPS_LED_ON;
>>   	}
>>   
>> +	pmbus_set_page(psu->client, 0);
>> +
>>   	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
>>   				       psu->led_state);
>>   	if (rc < 0)
>> @@ -299,6 +328,8 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
>>   	if (led_cdev->brightness == LED_OFF)
>>   		return 0;
>>   
>> +	pmbus_set_page(psu->client, 0);
>> +
>>   	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
>>   				       CFFPS_LED_BLINK);
>>   	if (rc < 0)
>> @@ -328,15 +359,32 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
>>   		dev_warn(dev, "failed to register led class: %d\n", rc);
>>   }
>>   
>> -static struct pmbus_driver_info ibm_cffps_info = {
>> -	.pages = 1,
>> -	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> -		PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
>> -		PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
>> -		PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
>> -		PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
>> -	.read_byte_data = ibm_cffps_read_byte_data,
>> -	.read_word_data = ibm_cffps_read_word_data,
>> +static struct pmbus_driver_info ibm_cffps_info[CFFPS_VERSIONS] = {
>> +	[0] = {
>> +		.pages = 1,
>> +		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> +			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
>> +			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
>> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
>> +			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
>> +			PMBUS_HAVE_STATUS_FAN12,
>> +		.read_byte_data = ibm_cffps_read_byte_data,
>> +		.read_word_data = ibm_cffps_read_word_data,
>> +	},
>> +	[1] = {
>> +		.pages = 2,
>> +		.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> +			PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
>> +			PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
>> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
>> +			PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
>> +			PMBUS_HAVE_STATUS_FAN12,
>> +		.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
>> +			PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
>> +			PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
>> +		.read_byte_data = ibm_cffps_read_byte_data,
>> +		.read_word_data = ibm_cffps_read_word_data,
>> +	},
>>   };
>>   
>>   static struct pmbus_platform_data ibm_cffps_pdata = {
>> @@ -346,13 +394,21 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
>>   static int ibm_cffps_probe(struct i2c_client *client,
>>   			   const struct i2c_device_id *id)
>>   {
>> -	int i, rc;
>> +	int i, rc, vs;
>>   	struct dentry *debugfs;
>>   	struct dentry *ibm_cffps_dir;
>>   	struct ibm_cffps *psu;
>> +	const void *md = of_device_get_match_data(&client->dev);
>> +
>> +	if (md)
>> +		vs = (int)md;
>> +	else if (id)
>> +		vs = (int)id->driver_data;
>> +	else
>> +		vs = 1;
>>   
>>   	client->dev.platform_data = &ibm_cffps_pdata;
>> -	rc = pmbus_do_probe(client, id, &ibm_cffps_info);
>> +	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs - 1]);
>>   	if (rc)
>>   		return rc;
>>   
>> @@ -364,6 +420,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>>   	if (!psu)
>>   		return 0;
>>   
>> +	psu->version = vs;
>>   	psu->client = client;
>>   	mutex_init(&psu->input_history.update_lock);
>>   	psu->input_history.last_update = jiffies - HZ;
>> @@ -406,12 +463,20 @@ static int ibm_cffps_probe(struct i2c_client *client,
>>   
>>   static const struct i2c_device_id ibm_cffps_id[] = {
>>   	{ "ibm_cffps1", 1 },
>> +	{ "ibm_cffps2", 2 },
>>   	{}
>>   };
>>   MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
>>   
>>   static const struct of_device_id ibm_cffps_of_match[] = {
>> -	{ .compatible = "ibm,cffps1" },
>> +	{
>> +		.compatible = "ibm,cffps1",
>> +		.data = (void *)1
>> +	},
>> +	{
>> +		.compatible = "ibm,cffps2",
>> +		.data = (void *)2
>> +	},
>>   	{}
>>   };
>>   MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
>> -- 
>> 1.8.3.1
>>